Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Patent
1989-11-09
1991-05-21
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
318626, 318696, 318685, 318258, 388810, 187116, G05B 1128
Patent
active
050178504
ABSTRACT:
A mobile member control apparatus is provided having a motor for moving a mobile member from a first position to a third position through a second position. The apparatus includes: a sensing device for sensing the travel speed and position of the mobile member; a speed presetting device for presetting upper and lower speed limit values, with the values becoming smaller as the mobile member travels closer to the third position; a deceleration rate presetting device for presetting at least two deceleration rates, Large and small; a comparing device for comparing the actual travel speed with the upper and lower limit values; and a motor control device for decelerating the motor, according to either the large or small deceleration rate, when the mobile member reaches the second position, and for decelerating the motor according to the large deceleration rate when the travel speed for the mobile member is greater than or equal to the upper limit value, and for decelerating the motor according to the small deceleration rate when the travel speed of the mobile member is less than or equal to the lower limit value.
REFERENCES:
patent: 4337428 (1982-06-01), Oltendorf
patent: 4485895 (1984-12-01), Taebino et al.
patent: 4698567 (1987-10-01), Gottwald et al.
patent: 4739231 (1988-04-01), Miyata et al.
patent: 4751984 (1988-06-01), Williams et al.
Araki Toshihiko
Harada Hiroyuki
Kajitani Tetsuji
Matsuura Yasumasa
Bergmann Saul M.
Mita Industrial Co. Ltd.
Shoop Jr. William M.
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